The NULL value in a field can be searched in a table using the ISNULL in the WHERE clause. For example to list all the students whose Age contains no value, the command is used as: SELECT * FROM Student WHERE Age IS NULL;

Transactional Control Language (TCL) commands are used to manage transactions in the database. These are used to manage the changes made to the data in a table by DML statements.

Oracle, MySQL, MS SQL Server, IBM DB2 and Microsoft Access are RDBMS packages.

When the slicing operation, you can specify a third argument as the stride, which refers to the number of characters to move forward after the first character is retrieved from the string. The default value of stride is 1.

strl = input ("Enter your name")
print (strl * 10)

(i) Data are raw facts stored in a computer. A data may contain any character, text, word or a number.
(ii) Information is formatted data, which allows to be utilized in a significant way.

Non-keyword variable arguments are called tuples.

A block within a block is called nested block. When the first block statement is indented by a single table space, the second block of statement is indented-by double tab spaces.

Scatter plot: A scatter plot is a type of plot that shows the data as a collection of points. The position of a point depends on its two dimensional value, where each value is a position on either the horizontal or vertical dimension.

SQlite_master is the master table which holds the key information about your database tables.

Executing C++Program through Python
(i) Double click the run terminal of MinGW
(ii) Go to the folder where the Python software is located (Python.exe) is located.
For example here "Python" is located in

In Python, a class is defined by using the keyword class. Every class has a unique name followed by a colon (:).
Syntax:
class class_name:
statement_1
statement_2
.................
.................
statement_n

A loop placed within another loop is called as nested loop structure. A while; within another while; for within another for; for within while and while within for to construc nested loops.

(i) print can have end, sep as parameters. end parameter can be used when we need to give any escape sequences like '\t' for tab, '\n' for new line and so on.
(ii) sep as parameter can be used to specify any special characters like, (comma) (semicolon) as separator between values

There may be situations in our real life programming where we need to skip a segment or set of statements and execute another segment based on the test of a condition. This is called alternative or branching.

DictReader ( ) gives OrderedDict by default in its output. An OrderedDict is a dictionary subclass which saves the order in which its contents are added. To remove the OrderedDict use dict ( ).

s = [x **2 for x in range (2,11,2)]
print (s)

(i) To include an element at your desired position, you can use insert ( ) function. The insert( ) function is used to insert an element at any position of a list.
(ii) Syntax:
List.insert (position index, element)

(i) Mylist contains another list as an element. This type of list is known as "Nested List': Nested list is a list containing another list as an element.
(ii) Example: Mylist = [ "Welcome", 3.14, 10, [2,4,6] ]

Asymptotic Notations are languages that uses meaningful statements about time and space complexity

(i) The way of defining an algorithm is called J algorithmic strategy.
(ii)  For example to calculate factorial for the given value n then it can be done by defining the function to calculate factorial once for the iteration-1 then it can be called recursively until the number of required iteration is reached.

(i) New line
(ii) Tab

A Relational operator is also called as Comparative operator which checks the relationship between two operands. If the relation is true, it returns True otherwise it returns False.

The prompt >>> indicates that Interpreter is ready to accept instructions. Therefore, the prompt on screen mean IDLE is working in interactive mode.

The LEGB rule is used to decide the order in which the scopes are to be searched for scope resolution. The scopes are listed below in terms of hierarchy (highest to lowest).

rational(n, d):
return [n, d]
numer(x):
return x[0]
denom(x):
return x[1]

let square x
return: x * x
let i: = 0;
ifi < strlen> (s) then
-- Do something which doesn't affect s
++i

a = int(input("Enter value of A:"))
b = int(input('Enter value of B:"))
print("Value of A = ",a, "\n Value of B = ",b)
(a, b) = (b, a)
print("Value of A = ",a, "\n Value of B = ",b)
Output:
Enter value of A: 54
Enter value of B: 38
value of A = 54
value of B = 38
value of A = 38
value of B = 54